gunrunnerjohn posted:With a 44:1 gear ratio, you can make this one really crawl. FWIW, I use the MTH tethers for TMCC upgrades as well, gives me plenty of pins. As for the smoke, I use MTH steam smoke units and mod the resistors for TMCC installations. Of course, I use them with the Super-Chuffer II and the Chuff-Generator, so I have power for the fan motor.
If you want to put an LED in there, consider a 470 ohm resistor and a bridge rectifier off the motor. The bridge rectifier will maintain the same polarity all the time to the LED, and the 470 ohm resistor is suitable for at least 12V on the motor.
I hope you don't mean the MTH electrocoupler, unless it's the PS/1 coupler. PS2/3 couplers are NOT compatible with TMCC coupler drive, they're much too low impedance.
Any specs I should keep in mind for a bridge rectifier, or can I just unsolder the one from the Williams reverse board and use that? Sure wish Radio Shack were still around sometimes. Going to have to google and see if I can find how to wire that up.
As for the electrocoupler, OOPS! Looks like these are PS2. Grabbed them instead of the PS1 because these had wires. Would it be possible to just raise the impedance by wiring a resistor inline? Do they provide replacement couplers with the PS1 to PS2 upgrade? Or doesn't it matter with the MTH innards? Just got an MTH Blue Comet pacific in today which I believe is PS1), and the tender's coupler is broken, so I was hoping to use one of them for that too (unless I can just swap electronics between the broken one and one of the PS2 couplers, as it's physically broken, not electronically.
